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Paper Abstract and Keywords
Presentation 2026-10-15 10:00
[Poster Presentation] Orbit Analysis for Multi-HAPS MIMO-OFDM Systems
Ryota Takagi, Mitoshi Fujimoto (Fukui Univ), Koyo Tategami, Daisuke Goto, Kiyohiko Itokawa (NTT, Inc.) AP2026-103
Abstract (in Japanese) (See Japanese page) 
(in English) Next-generation mobile communication systems (6G) require ubiquitous connectivity, and the use of High Altitude Platform Stations (HAPS) is being considered as a solution. Additionally, the OFDM transmission scheme is being evaluated for its high transmission efficiency. To achieve higher communication capacity, MIMO technology is also a candidate, prompting the study of communications involving multiple HAPS. However, applying OFDM to HAPS-based communication carries the risk of signal degradation due to Doppler shifts and propagation delays caused by HAPS movement. This report analyzes the impact of HAPS trajectories on communication coverage in scenarios involving multiple HAPS. Specifically, regions capable of stable communication are estimated by accounting for received power, Doppler frequency differences, and propagation delay differences. Through simulations, the relationship between HAPS trajectories and communication coverage is clarified, and orbital conditions enabling stable communication over a wider area are identified.
Keyword (in Japanese) (See Japanese page) 
(in English) HAPS / OFDM transmission / MIMO / / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 191, AP2026-103, pp. 6-7, Oct. 2026.
Paper # AP2026-103 
Date of Issue 2026-10-08 (AP) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Notes on Review This article is a technical report without peer review, and its polished version will be published elsewhere.
Download PDF AP2026-103

Conference Information
Committee AP  
Conference Date 2026-10-14 - 2026-10-16 
Place (in Japanese) (See Japanese page) 
Place (in English) Hotel Épinard Nasu 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Student Session, Antennas and Propagation 
Paper Information
Registration To AP 
Conference Code 2026-10-AP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Orbit Analysis for Multi-HAPS MIMO-OFDM Systems 
Sub Title (in English)  
Keyword(1) HAPS  
Keyword(2) OFDM transmission  
Keyword(3) MIMO  
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1st Author's Name Ryota Takagi  
1st Author's Affiliation University of Fukui (Fukui Univ)
2nd Author's Name Mitoshi Fujimoto  
2nd Author's Affiliation University of Fukui (Fukui Univ)
3rd Author's Name Koyo Tategami  
3rd Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT, Inc.)
4th Author's Name Daisuke Goto  
4th Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT, Inc.)
5th Author's Name Kiyohiko Itokawa  
5th Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT, Inc.)
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Speaker Author-1 
Date Time 2026-10-15 10:00:00 
Presentation Time 110 minutes 
Registration for AP 
Paper # AP2026-103 
Volume (vol) vol.126 
Number (no) no.191 
Page pp.6-7 
#Pages 2 
Date of Issue 2026-10-08 (AP) 

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